Manufacture of dyes of the cerulein series.



UNITED STATEET OFFICE.

ARNOLD STEINER, OF BASEL, SWITZERLAND.

MANUFACTURE OF DYES OF THE CERULEIN SERIES.

No Drawing.

. which the following is a specification.

It is known, as is evidenced by British Patent No. 14,220 of 1900, that amino-metaoxybenzoylbenzoic acids substituted in the amino group give on condensation with These new products dye mordanted wool and cotton in 'deep reen to blue shades; they possess the excellent qualities of fastness of cerulein. Unlike cerulein, however, these new bodies'are easily soluble in water and are, therefore, well adapted for calico printing.- The chromium lake is of a dark green, very fast to light-,the tannin lake is a dark blue.

According to British Patent No. 22,818 of 1907, similar colors have been produced by condensing 7 amino metaoxybenzoylbenzoic acids substituted in the amino group with ,oxyhydroquinone, and by subsequently splitting ofi' H OL. Oxyhydroquinone is not easily obtained and is not a cheap product. Furthermore, the unsulfonated.colors as described in the patent are not very sol able and are less fit for calico .printingthan those obtained by the present process.

My invention may be carried out by the processes set forth in the following examples, it being understood, however, that various other methods may be successfully pursued and that the examples are to be regarded as illustrative merely.

. Example I: 1 part of the phthalein coloring matter obtained by condensation of diethylamino-meta-oxybenzoylbenzoic acid with pyrogallol is dissolved in 10 parts of sulfuric 'acidof 96% strength; the solution is heated slowly to 155-160 C. and this temperature maintained during 5-6 hours,

' Specification of Letters Patent.

Patented Feb. 25, 1913.

Application filed July 23, 1912. Serial No. 711,031.

pyrogallol or its derivatives coloring matters which dye chrome lllOltltllitQtl wool from blue to violet. I have found that these coloring matters can easily be converted into new products by treatment with dehydrating agents, as, for instance, concentrated sulfuric acid, whereby water is split off and the carboxyl group of the phthalic acid radical combines with the hydrogenatom in para position to .the remaining hydroxyl group.

until a test gives a blue solution in water, and when salted out givesa very weak, slightly yellowish red filtration. The sulfuric acid solution, which at the beginning was a deep red, is now 'of'a yellowish brown color. The mass is now poured'into a relatively large amount of water and becomes completely dissolved therein. By salting out,

the hydrochlorid is obtained .as a dark,

crystalline precipitate. By redissolving and again salting out, the color is obtained pure. In this example, sulfuric acid of greater strength than that mentioned may be used when, for example, weakly filming acid is used the condensation takes place more quickly and at a lowertemperature. Example TI: Mix together 31 kilograms of diethylamino meta oxybenzoy'lbenzoic acid and 13 kilograms ofpyrogallol, and then add 35 kilograms of sulfuric acid of 75% strength and heat-lz-ouya water bath. The mass very soon becomes liquid and acquires a metallicluster,and after heating for 78 hours it becon' es,crysttrlline. Add slowly 300 kilograms of fiiining sulfuric acid containing 10427;; S0, and heat during about three hoursto150-155 C. until the red coloration has disappeared and a test dissolves in water with a blue color. The salting out, elc., is done as in Example I. The color obtained by carrying out the processes of the above examples is a dark violet powder, easily soluble in water with a blue coloration; on the addition of soda or soda lye the color base is precipitated as a dark green mass. In concentrated sulfuric acid it dissolves with a yellowish brown tint; on diluting with water a pure blue solution is obtained.

If instead of the coloring matter from diethylamino meta oxybenzoylloenzoic acidand pyrogallol, the corresponding product from the dimethylamino meta oxybenzoylbenzoic acid is used, a readily soluble green coloring matter is obtained which gives a dark green chrome 1. The process of making coloring mat ters, which consists in treating with a dehydrating agent the productfo-rmed by con densing amino-meta-oxybenzoylbenzoic acid substituted in the amino group with pyrogallol.

lake of excellent fastness.

2. The process of'makingcoloring matters, which consists in treating with a dehydrating agent the product formed by condensing diethylamino-meta-oxybenzoylbenzoic acid with pyrogallol. 3. The process of making coloring matters, which consists in treating with sulfuric acid the product formed by condensing amino-meta-oxyloenzoylbenzoic acid substitutedinthe amino group with pyrogallol.

4. The process of making coloring matters, which consists in treating with sulfuric acid the product formed byco-ndensing diethylamino meta oxybenzoylbenzoic acid with pyrogallol. u

5.The p'rocessof making coloring matters, which consists in treating with sulfuric acid the product formed bycondensing diethlyamino meta oxybenzoylbenzoic acid with pyrogallohand heating until a test portion gives a blue solution in water, and.

then dissolving the mass in water and finally salting out.

6, As new products, the herein described coloring matters obtainable by condensing -amino-meta-oxybenzoylbenzoic acid substituted in the amino group with pyrogallol, then treating the product thus formed with a dehydrating agent and heating until a test portion shows the condensation to be complete, then-dissolving the mass in water and finally salting out, said coloring matters being readily soluble in water and readily soluble-in concentrated sulfuric acid with a yellowish brown tint which is changed to blue upon dilution with water, and yielding adark green precipitate upon addition to form of a dark violet powder, easily soluble in water with a blue coloration, soluble in concentrated sulfuric'acid with a yellowish brown tint which is changed to blue upon dilution with water, and yielding a dark green precipitate upon addition to the water solution thereof of soda.-

In testimony whereof, I have hereunto set my hand,in.the presence of two subscribing witnesses. p

ARNOLD STEINER.

'Witnesscs: I

MELoH'Ion BtSNIGER, GEORGE H. WAGNER. 

